<div class="panel panel-primary">
  <div class="panel-heading">父组件</div>
  <div class="panel-body">
    <child-one></child-one>
    <child-one></child-one>
    <child-one></child-one>
    <child-one></child-one>
    <child-one></child-one>
  </div>
</div>

<div class="panel" contenteditable="true">
</div>